Sith/sas/models.py

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#
# Copyright 2023 © AE UTBM
# ae@utbm.fr / ae.info@utbm.fr
#
# This file is part of the website of the UTBM Student Association (AE UTBM),
# https://ae.utbm.fr.
#
# You can find the source code of the website at https://github.com/ae-utbm/sith3
#
# LICENSED UNDER THE GNU GENERAL PUBLIC LICENSE VERSION 3 (GPLv3)
# SEE : https://raw.githubusercontent.com/ae-utbm/sith3/master/LICENSE
# OR WITHIN THE LOCAL FILE "LICENSE"
#
#
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from __future__ import annotations
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from io import BytesIO
from django.conf import settings
from django.core.cache import cache
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from django.db import models
from django.db.models import Exists, OuterRef
from django.urls import reverse
from django.utils import timezone
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from django.utils.translation import gettext_lazy as _
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from PIL import Image
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from core.models import SithFile, User
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from core.utils import exif_auto_rotate, resize_image
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class SasFile(SithFile):
"""Proxy model for any file in the SAS.
May be used to have logic that should be shared by both
[Picture][sas.models.Picture] and [Album][sas.models.Album].
"""
class Meta:
proxy = True
def can_be_viewed_by(self, user):
if user.is_anonymous:
return False
cache_key = (
f"sas:{self._meta.model_name}_viewable_by_{user.id}_in_{self.parent_id}"
)
viewable: list[int] | None = cache.get(cache_key)
if viewable is None:
viewable = list(
self.__class__.objects.filter(parent_id=self.parent_id)
.viewable_by(user)
.values_list("pk", flat=True)
)
cache.set(cache_key, viewable, timeout=10)
return self.id in viewable
def can_be_edited_by(self, user):
return user.is_root or user.is_in_group(pk=settings.SITH_GROUP_SAS_ADMIN_ID)
class PictureQuerySet(models.QuerySet):
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def viewable_by(self, user: User) -> PictureQuerySet:
"""Filter the pictures that this user can view.
Warnings:
Calling this queryset method may add several additional requests.
"""
if user.is_root or user.is_in_group(pk=settings.SITH_GROUP_SAS_ADMIN_ID):
return self.all()
if user.was_subscribed:
return self.filter(is_moderated=True)
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return self.filter(people__user_id=user.id, is_moderated=True)
class SASPictureManager(models.Manager):
def get_queryset(self):
return super().get_queryset().filter(is_in_sas=True, is_folder=False)
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class Picture(SasFile):
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class Meta:
proxy = True
objects = SASPictureManager.from_queryset(PictureQuerySet)()
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@property
def is_vertical(self):
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with open(settings.MEDIA_ROOT / self.file.name, "rb") as f:
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im = Image.open(BytesIO(f.read()))
(w, h) = im.size
return (w / h) < 1
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def get_download_url(self):
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return reverse("sas:download", kwargs={"picture_id": self.id})
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def get_download_compressed_url(self):
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return reverse("sas:download_compressed", kwargs={"picture_id": self.id})
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def get_download_thumb_url(self):
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return reverse("sas:download_thumb", kwargs={"picture_id": self.id})
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def get_absolute_url(self):
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return reverse("sas:picture", kwargs={"picture_id": self.id})
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def generate_thumbnails(self, *, overwrite=False):
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im = Image.open(BytesIO(self.file.read()))
try:
im = exif_auto_rotate(im)
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except:
pass
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file = resize_image(im, max(im.size), self.mime_type.split("/")[-1])
thumb = resize_image(im, 200, self.mime_type.split("/")[-1])
compressed = resize_image(im, 1200, self.mime_type.split("/")[-1])
if overwrite:
self.file.delete()
self.thumbnail.delete()
self.compressed.delete()
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self.file = file
self.file.name = self.name
self.thumbnail = thumb
self.thumbnail.name = self.name
self.compressed = compressed
self.compressed.name = self.name
self.save()
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def rotate(self, degree):
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for attr in ["file", "compressed", "thumbnail"]:
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name = self.__getattribute__(attr).name
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with open(settings.MEDIA_ROOT / name, "r+b") as file:
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if file:
im = Image.open(BytesIO(file.read()))
file.seek(0)
im = im.rotate(degree, expand=True)
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im.save(
fp=file,
format=self.mime_type.split("/")[-1].upper(),
quality=90,
optimize=True,
progressive=True,
)
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def get_next(self):
if self.is_moderated:
pictures_qs = self.parent.children.filter(
is_moderated=True,
asked_for_removal=False,
is_folder=False,
id__gt=self.id,
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)
else:
pictures_qs = Picture.objects.filter(id__gt=self.id, is_moderated=False)
return pictures_qs.order_by("id").first()
def get_previous(self):
if self.is_moderated:
pictures_qs = self.parent.children.filter(
is_moderated=True,
asked_for_removal=False,
is_folder=False,
id__lt=self.id,
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)
else:
pictures_qs = Picture.objects.filter(id__lt=self.id, is_moderated=False)
return pictures_qs.order_by("-id").first()
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class AlbumQuerySet(models.QuerySet):
def viewable_by(self, user: User) -> PictureQuerySet:
"""Filter the albums that this user can view.
Warnings:
Calling this queryset method may add several additional requests.
"""
if user.is_root or user.is_in_group(pk=settings.SITH_GROUP_SAS_ADMIN_ID):
return self.all()
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if user.was_subscribed:
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return self.filter(is_moderated=True)
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# known bug : if all children of an album are also albums
# then this album is excluded, even if one of the sub-albums should be visible.
# The fs-like navigation is likely to be half-broken for non-subscribers,
# but that's ok, since non-subscribers are expected to see only the albums
# containing pictures on which they have been identified (hence, very few).
# Most, if not all, of their albums will be displayed on the
# `latest albums` section of the SAS.
# Moreover, they will still see all of their picture in their profile.
return self.filter(
Exists(Picture.objects.filter(parent_id=OuterRef("pk")).viewable_by(user))
)
class SASAlbumManager(models.Manager):
def get_queryset(self):
return super().get_queryset().filter(is_in_sas=True, is_folder=True)
class Album(SasFile):
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class Meta:
proxy = True
objects = SASAlbumManager.from_queryset(AlbumQuerySet)()
@property
def children_pictures(self):
return Picture.objects.filter(parent=self)
@property
def children_albums(self):
return Album.objects.filter(parent=self)
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def get_absolute_url(self):
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return reverse("sas:album", kwargs={"album_id": self.id})
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def get_download_url(self):
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return reverse("sas:album_preview", kwargs={"album_id": self.id})
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def generate_thumbnail(self):
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p = (
self.children_pictures.order_by("?").first()
or self.children_albums.exclude(file=None)
.exclude(file="")
.order_by("?")
.first()
)
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if p and p.file:
im = Image.open(BytesIO(p.file.read()))
self.file = resize_image(im, 200, "jpeg")
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self.file.name = self.name + "/thumb.jpg"
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self.save()
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def sas_notification_callback(notif):
count = Picture.objects.filter(is_moderated=False).count()
if count:
notif.viewed = False
else:
notif.viewed = True
notif.param = "%s" % count
notif.date = timezone.now()
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class PeoplePictureRelation(models.Model):
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"""The PeoplePictureRelation class makes the connection between User and Picture."""
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user = models.ForeignKey(
User,
verbose_name=_("user"),
related_name="pictures",
null=False,
blank=False,
on_delete=models.CASCADE,
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)
picture = models.ForeignKey(
Picture,
verbose_name=_("picture"),
related_name="people",
null=False,
blank=False,
on_delete=models.CASCADE,
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)
class Meta:
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unique_together = ["user", "picture"]
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def __str__(self):
return self.user.get_display_name() + " - " + str(self.picture)